Page 192 - BA2 Integrated Workbook - Student 2017

Chapter 12

4.2 Standard normal distribution

To use the normal distribution we first have to convert our normal distribution to a
standard normal distribution.

A standard normal distribution has:

 a mean of 0

 a standard deviation of 1

This special distribution is denoted by z and can be calculated as:

x – µ
z = ——
σ

Where:

z is the z score

x is the value being considered

μ is the mean

σ is the standard deviation

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